Why Am I Getting a \'ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long\' When Connecting to MySQL?

"ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long" on MySQL Connection

Error Summary:

When attempting to connect to a MySQL database, an error occurs due to an inability to cast a java.math.BigInteger instance to a java.lang.Long instance.

Cause of the Error:

The Java ClassCastException is thrown when an attempt is made to cast an object from one class to another unrelated class. In this case, MySQL Connector/J is internally attempting to cast a BigInteger instance (which is a precise integer type) to a Long instance (which is a primitive integer type).

Resolution:

The underlying issue appears to stem from a version mismatch between your MySQL database and the mysql-connector.jar library. It is recommended to update to a newer version of MySQL Connector/J, such as 5.1.47 or 8.0.12.

Steps to Resolve:

1. Go to https://dev.mysql.com/downloads/connector/j/.
2. Select the desired MySQL Connector/J version.
3. Download the appropriate JDBC driver for your system.
4. Replace the existing mysql-connector.jar library with the new one.
5. Restart your application.

By upgrading MySQL Connector/J to a compatible version, the ClassCastException should be resolved and the connection to MySQL should succeed.

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